Goodman Furnace: Test the ECM motor with the UltraCheck-EZ diagnostic tool
Test the ECM motor with the UltraCheck-EZ diagnostic tool on a Goodman furnace: The UltraCheck-EZ (part UTT-01) is the preferred tool to diagnose the ECM motor. Use the LED and button status to decide the next step.
Applies to: ECM blower motors on ACVC96/AMVC96/GCVC96/GMVC96
How to fix test the ecm motor with the ultracheck-ez diagnostic tool: step by step
- Disconnect power to the furnace.
- Disconnect the 4-circuit control harness from the motor.
- Plug the 4-circuit connector from the tool into the motor control connector.
- Connect one alligator clip to a ground source and the other to a 24VAC source. The clips are not polarized.
- Only connect the tool to 24VAC. Other sources can blow the non-replaceable fuse and damage the tool.
- Turn on furnace power.
- Press the orange power button to send a run signal. Allow up to 5 seconds for the motor to start.
- If the orange button does not light, check for an open fuse or a bad 24VAC connection.
- Use the indication table to decide the next step.
- Press the orange button to turn the motor off, disconnect power, remove the tool, and reconnect the 4-wire harness.
If the unit shows an error code, look it up: Goodman Furnace codes
Source: Goodman GMVC96 service and troubleshooting manual, p. 44-45. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.